Receiving apparatus including a display for displaying the amount of unrecorded memory

ABSTRACT

There is a receiving apparatus in which the received data is recorded by a recording head which accesses each portion of a recording medium. This receiving apparatus comprises: a discriminating circuit to discriminate whether the portion accessed by the recording head is the recorded portion or the unrecorded portion upon reception; and a control circuit for allowing the recording head to access the unrecorded portion on the basis of the result of the discrimination of the discriminating circuit. Upon reception, the control circuit controls the recording head so as to automatically access the unrecorded portion. Further, upon reception, an amount of unrecorded portions is displayed.

This application is a continuation of application Ser. No. 08/138,198,filed Oct. 20, 1993, abandoned, which is a division of application Ser.No. 08/047,620, filed Apr. 16, 1993, now U.S. Pat. No. 5,276,581, whichis a continuation of application Ser. No. 07/735,267, filed Jul. 24,1991, now abandoned, which is a divisional of application Ser. No.07/456,531, filed Dec. 26, 1989, now U.S. Pat., No. 5,053,896, which isa divisional of application Ser. No. 07/048,840, filed May 12, 1987, nowabandoned.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a receiving apparatus and, moreparticularly, to a receiving apparatus for recording the received dataonto a recording medium.

2. Related Background Art

Hitherto, for example, a facsimile apparatus has been known as atransmitting and receiving apparatus for recording the received dataonto a recording medium such as, e.g., paper or the like.

In such a facsimile apparatus, the paper as a recording medium is fed ata constant speed, thereby enabling the recording head to always accessthe unrecorded portion of the paper.

On the other hand, for example, there is considered a receivingapparatus for recording the received data at an arbitrary position of arecording medium which can be accessed at random.

However, since such a receiving apparatus records the data at anarbitrary position of the recording medium, if the portion accessed bythe recording means is unexpectedly the portion at which the data hasalready been recorded, the problem occurs that data may be written overpreviously recorded data.

In the apparatus such as a facsimile apparatus, memory means is providedand the data which has once been received is written on the memorymedium and after completion of the writing of this data, it is recordedonto a recording medium.

For example, if a disk-shaped rotary medium is used as a recordingmedium, the recording medium needs to be set into the recordable state,namely, the rotary medium needs to be rotated at a constant speed.Therefore, there is a problem such that if the recording medium isdriven in response to the completion of the storage of data into thememory means, a time lag occurs until the apparatus enters the actuallyrecordable state.

On the other hand, in such a conventional facsimile apparatus, when thepaper (as a recording medium onto which the received data is to berecorded) does not exist in the apparatus, a warning indicates that datacannot be received.

However, in the conventional facsimile apparatus, the amount ofremaining unrecorded portion of the recording medium is not displayed.Therefore, when a large amount of data is transmitted, there is aproblem such that it is impossible to know whether all of the data canbe received and recorded or not. This problem occurs in not only thefacsimile apparatus but also the receiving apparatus for receiving andrecording the data onto the recording medium such as, e.g., thereceiving apparatus for receiving and recording still image data onto arecording medium such as a magnetic sheet.

SUMMARY OF THE INVENTION

It is the first object of the present invention to provide a receivingapparatus which can solve each of or all of the foregoing problems.

Another object of the invention is to provide a receiving apparatus inwhich even when the portion of a recording medium at the access positionof the recording means is the portion onto which the data has alreadybeen recorded, the received data can still be recorded onto therecording medium.

To accomplish these objects, according to a preferred embodiment of theinvention, in a receiving apparatus for recording the received data ontoa recording medium by recording means for accessing each portion of therecording medium, there is provided a receiving apparatus comprising:discriminating means for discriminating whether the portion accessed bythe recording means is a recorded portion or an unrecorded portion uponreception; and control means for allowing the recording means to accessthe unrecorded portion on the basis of the result of the discriminationof the discriminating means, wherein upon reception, the recording meansis controlled by the control means so as to automatically access theunrecorded portion.

Still another object of the invention is to provide a receivingapparatus which can promptly record the received data onto a recordingmedium upon completion of the reception of the data.

To accomplish this object, according to a preferred embodiment of theinvention, in a receiving apparatus for recording the received data ontoa recording medium, there is provided a receiving apparatus comprising:memory means for temporarily storing the received data before it isrecorded onto the recording medium; driving means for driving therecording medium; and control means for making the driving meansoperative only a predetermined period of time before completion of thestorage of the data into the memory means, wherein since the recordingmedium is driven only the predetermined period of time before completionof the storage of the data into the memory means, the data can beimmediately recorded onto the recording medium in response to thecompletion of the storage of the data into the memory means.

Still another object of the invention is to provide a receivingapparatus in which upon reception of data, an amount of data which canbe received is displayed so as to be easily known.

To accomplish this object, according to a preferred embodiment of theinvention, in a receiving apparatus for recording the received data ontoa recording medium, there is provided a receiving apparatus havingdisplay means for displaying an amount of the unrecorded portion of arecording medium which can be recorded upon reception of data, whereinthe amount of the unrecorded portion of the recording medium which canbe recorded is displayed by the display means upon reception of data bythe receiving apparatus.

Still another object of the invention is to provide a reproducingapparatus in which the data recorded on a recording medium is read outand converted into an electric signal displayed as a visual data on amonitor, the data recorded is temporarily stored into memory means suchas a semiconductor memory, and thereafter the data is read out of thememory means and can be preferably displayed on the monitor.

It is still another object of the invention to provide a reproducingapparatus for reproducing the data recorded on a recording medium,wherein it is possible to prevent the data from being erroneouslyrewritten in a memory into which the reproduced data is stored.

To accomplish this object, according to a preferred embodiment of theinvention, there is provided a reproducing apparatus comprising:reproducing means whose access position on a recording medium changesand which reproduces data recorded on the recording medium; memory meansfor storing the data reproduced by the reproducing means; and controlmeans having a first mode in which the data reproduced by thereproducing means is written into the memory means in accordance withthe changed access position of the reproducing means and the second modein which the writing of data into the memory means is inhibited evenwhen the access position of the reproducing means was changed, whereinby enabling the switching between the first and second modes, it isprevented that the data stored in the memory means is carelesslyrewritten.

The above and other objects and features of the present invention willbecome apparent from the following detailed description and the appendedclaims with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 (made up of FIGS. 1A and 1B) is a block diagram showing aconstitution of a transmitting and receiving apparatus according to anembodiment of the present invention;

FIG. 2 is a flowchart for explaining the operation of a control circuit100 shown in FIG. 1; and

FIGS. 3 to 6, 7 (made up of FIGS. 7A, 7B and 7C), and 8 (made up ofFIGS. 8A, 8B and 8C) are diagrams showing a detailed flow for eachroutine shown in FIG. 2.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

In an embodiment of the present invention which will be explainedhereinafter, an explanation will be given with respect to a transmittingand receiving apparatus which has the function of recording still imagedata onto concentric tracks formed on a magnetic sheet, and the functionof transmitting the still image data recorded on the magnetic sheet, andin which the transmitted still image data can be recorded on themagnetic sheet. However, the invention is not limited to only thisapparatus.

An embodiment of the invention will now be explained in detailhereinbelow with reference to the drawings.

FIG. 1 is a block diagram showing a constitution of the transmitting andreceiving apparatus according to an embodiment of the invention.

In FIG. 1, reference numeral 1 denotes a disk-shaped magnetic sheet toor from which data (such as a video signal, an audio signal, or thelike) can be recorded or reproduced. Fifty concentric tracks are formedon the magnetic sheet shown in the embodiment. The video signal of onefield or the audio signal of a predetermined time is recorded on eachtrack.

A motor 2 rotates the magnetic sheet 1 at a predetermined rotationalspeed (3600 r.p.m in the case of the NTSC standard) synchronized withthe vertical sync signal of the video signal.

A head carriage 3 supports a head 5. By driving the step motor 4, theaccess position on the magnetic sheet 1 of the head 5 supported by thehead carriage 3 can be controlled.

The step motor 4 drives the head carriage 3.

The head 5 is commonly used to record and reproduce data in theembodiment.

A driver 6 outputs a signal to drive the step motor 4 on the basis of acontrol signal of a control circuit 100. For example, in response to theoperations of a track-up switch 107 and a track-down switch 108, whichwill be explained hereinlater, the control circuit 100 changes theaccess position on the magnetic sheet 1 of the head 5 or outputs acontrol signal to the driver 6 when the operation to detect therecording states of the tracks, which will be explained hereinlater, isexecuted, thereby changing the access position of the head 5.

A reproduction processor 7 performs the processes such aspreamplification, clamping, and the like of the reproduction outputswhich are reproduced from the tracks on the magnetic sheet 1 by the head5.

A level detector 8 detects whether output data to be reproduced by thehead 5 exists on the track on the magnetic sheet 1 or not. Namely, thelevel detector 8 detects whether data has already been recorded or notyet recorded on the track which is accessed by the head 5, by use of thefollowing principle. Practically speaking, when a signal has beenrecorded on the track on the magnetic sheet, the reproduced output levelof the head 5 is greater than a predetermined level. When no signal isrecorded on the track on the magnetic sheet 1, the reproduced outputlevel of the head 5 is smaller than the predetermined level.

An RGB matrix circuit 9 separates the signal processed by thereproduction processor 7 into the R, G, and B components.

A/D converters 10, 11, and 12 A/D convert the signals of the R, G, and Bcomponents separated by the RGB matrix circuit 9.

An R memory, a G memory, and a B memory store the digital signals of theR, G, and B components which were A/D converted by the A/D converters10, 11, and 12. Each of the R, G, and B memories can store the videosignal of one frame.

D/A converters 16, 17, and 18 convert the digital signals stored in theR, G, and B memories 13, 14, and 15 into the analog signals.

A color difference matrix circuit 19 outputs color difference signalsR-Y and B-Y and a luminance signal Y from the R, G, and B componentsignals which were D/A converted by the D/A converters 16, 17, and 18.

An encoder 20 modulates the color difference signals R-Y and B-Y andluminance signal Y which are input through a change-over switch SW₃ andthen outputs a standard television (TV) signal based on the NTSCstandard to a monitor 30.

A decoder 22 receives a standard TV signal of the NTSC standard throughan external input terminal 21 and demodulates and outputs the colordifference signals R-Y and B-Y and luminance signal Y.

A memory controller 23 controls the writing and reading operations ofthe R, G, and B memories 13 to 15. The memory controller 23 writes theoutput of an A/D converter 24, which will be explained hereinafter, intothe R, G, and B memories 13 to 15. The memory controller 23 also readsout the signals written in the memories 13 to 15 and outputs to a D/Aconverter 26.

A modulation signal transmitted through a telephone line 31, (amodulation signal which is divided into the R, G, and B components andwhich time sequentially transmits every component) is received and thendemodulated to an analog signal by a demodulator 25. This analog signalis converted into the digital signal by a A/D converter 24.

The demodulator 25 demodulates the modulation signal which is inputthrough the telephone line 31.

The D/A converter 26 converts the digital signals, which were read outof the R, G, and B memories 13 to 15 by the memory controller 23, intoanalog signals.

A modulator 27 modulates the analog signals converted by the D/Aconverter 26 and transmits them through the telephone line 31.

The converting rates of the A/D converter 24 and D/A converter 26 aresmaller than those of the A/D converters 10 to 12 and D/A converters 16to 18. Namely, since the A/D converters 10 to 12 and D/A converters 16to 18 write or read out data into or from the memories 13 to 15 for onefield period of the standard television signal, very high convertingrates are required. On the other hand, since the A/D converter 24 andD/A converter 26 write or read out data into or from the memories 13 to15 for the period of time of a few minutes through a telephone linehaving a small band, the converting rates are smaller than those of theA/D converters 10 to 12 and D/A converters 16 to 18.

A receiving detection circuit 28 detects a call signal (corresponding tothe call sound of the telephone) which is transmitted prior totransmission of the video signal through the telephone line 31 andoutputs a reception command signal.

The monitor 30 reproduces the standard television signal which is inputthrough the telephone line 31.

Numeral 31 denotes the telephone line.

A magnetic sheet detection circuit 32 detects the presence or absence ofthe magnetic sheet 1 on the basis from signals of photo interrupters32-A and 32-B.

When the magnetic sheet 1 is present, the optical paths of the photointerrupters 32-A and 32-B are interrupted by the sheet 1. When themagnetic sheet 1 is not present, the optical paths of the photointerrupters 32-A and 32-B are not interrupted. By detecting thedifference between the outputs of the photo interruptors, the detectioncircuit 32 detects the presence or absence of the magnetic sheet andsends the result of the detection to the control circuit 100.

A recording processor 33 modulates the signal which is input through aswitch SW₄ and sends it to the head 5.

A display device 35 is driven by an output of the control circuit 100and displays the state in which automatic reception is impossible andalso displays the number of remaining recordable tracks in the automaticreceiving mode.

A motor drive circuit 36 is made operative or inoperative by an outputof the control circuit 100.

A change-over switch SW₁ connects the head 5 to the reproductionprocessor 7 in the reproducing mode. The switch SW₁ connects the head 5to the recording processor 33 in the recording mode.

When the video signal which is input through the external input terminal21 is output to the monitor 30, a change-over switch SW₂ connects thedecoder 22 to the switch SW₃. When the video signal reproduced from themagnetic sheet 1 is output to the monitor 30, the switch SW₂ connectsthe reproduction processor 7 to the switch SW₃.

When the video signal reproduced from the magnetic sheet 1 is directlyoutput to the monitor 30, the changeover switch SW₃ connects the switchSW₂ to the encoder 20. When the video signals stored in the R, G, and Bmemories 13 to 15 are output to the monitor 30, the switch SW₃ connectsthe color difference matrix circuit 19 to the encoder 20.

When the video signals stored in the R, G, and B memories 13 to 15 arerecorded onto the magnetic sheet 1, the change-over switch SW₄ connectsthe color difference matrix circuit 19 to the recording processor 33.When the video signal which is input through the external input terminal21 is recorded onto the magnetic sheet 1, the switch SW₄ connects thedecoder 22 to the recording processor 33.

The connecting states of the switches SW₁ to SW₄ are switched by thecontrol circuit 100.

The control circuit 100 switches the connecting states of the switchesSW₁ to SW₄ and drives the driver 6 and memory controller 23.

The following switches are connected to the control circuit 100: areproduction mode setting switch 101 to set the reproduction mode; arecording mode setting switch 102 to set the recording mode; atransmission mode setting switch 103 to set the transmission mode; areceiving mode setting switch 104 to set the receiving mode; a startswitch 105 to start the transmission when the transmission mode is set;a stop switch 106 to stop the transmitting operation which was startedby pressing the start switch; a track-up switch 107 to shift the accessposition on the magnetic sheet 1 of the head 5 to the inner peripheralside; a track-down switch 108 to shift the access position on themagnetic sheet 1 of the head 5 to the outer peripheral side; a memorylock switch 109 to inhibit the rewriting of data in the R, G, and Bmemories 13 to 15; a recording execution switch 110 to execute therecording of data onto the magnetic sheet 1 in the recording mode; andan automatic receiving mode setting switch 111 to set the automaticreceiving mode.

The memory lock switch 109 is a bistable type switch having a mode toset the memory lock state and a mode to release the memory lock state.The control circuit 100 also receives the detection output of themagnetic sheet detection circuit 32.

The control circuit 100 has therein a memory to store the recordingstate of each track on the magnetic sheet 1 which is derived by, e.g.,the track recording state detecting operation, which will be explainedhereinafter.

The operation of the transmitting and receiving apparatus shown in FIG.1 will now be described with reference to FIG. 2.

FIG. 2 is a flowchart for fundamental operation of the transmitting andreceiving apparatus shown in in FIG. 1.

When the power source is turned on, a check is made to see if themagnetic sheet 1 is present or not (step 1). If the sheet has been set,the track recording state is detected (step 2) in the following manner.For example, the reproducing head is sequentially scanned from theinnermost track to the outermost track (or from the outermost track tothe innermost track) of the tracks to be recorded on the magnetic sheet1. The presence or absence of the reproduction signals is detected bythe level detector 8, thereby deciding whether the detected track is arecorded track or an unrecorded track. The results of the discriminationare stored. Data indicative of the results of the discrimination may besequentially corrected in accordance with the recording and erasingoperations.

After completion of this correction, the input signals which aresupplied to the control circuit 100 from the switches 101 and 102 shownin FIG. 1 are detected to determine whether the operating mode is thereproduction mode or recording mode (step 3).

The reproduction mode will be first explained hereinbelow. In this mode,the processing routine advances to step 4 and the reproductioninitializing operation is performed as a pre-stage for reproduction. Adetailed flowchart for this step will now be explained with reference toFIG. 3.

In FIG. 3, a memory lock flag MLF is first reset to release the memorylock state. Thus, the image data reproduced from the magnetic sheet 1are automatically stored in the memories 13 to 15 (step 3-1). After theflag is reset, the driver 6 is driven such that the reproducing headaccesses the first track (outermost track) (step 3-2). When it isdetected by the level detector 8 that the first track is a recordedtrack, a freeze operation is performed, namely, the memory controller 23is made operative such that the video signal obtained from the trackwhich is being reproduced at present by the head 5 is written in thememories 13 to 15 (step 3-4). After the video signals are written intothe memories 13 to 15, the switch SW₃ is switched to the memories 13 to15 from the switch SW₂, thereby making the memory controller 23operative so as to repeatedly read out the signals stored in thememories 13 to 15 (step 3-5).

On the other hand, if it is detected by the level detector 8 in step 3-3that the first track is an unrecorded track, the memory controller 23 ismade operative so as to erase the data in the memories and the videodata in the whole picture plane is all rewritten to a black level signal(step 3-6).

After completion of the above operations, the processing routineadvances to step 5 in FIG. 2.

In step 5, a check is made to see if the track-up switch 107 has beenturned on or not. If NO, a check is similarly made in step 6 to see ifthe track-down switch 108 has been turned on or not. If the switches 107and 108 have been turned on, the subroutine to feed the track shown inFIG. 4 is executed.

The track feed subroutine will now be explained with reference to FIG.4. The head is fed by one track in the direction corresponding to thefeeding or returning operation of the track (steps 4-1 to 4-3). In thenext step 4-4, the switch SW₃ is switched to the switch SW₂ from thememories 13 to 15, and the connecting state of the memory lock switch109 is checked in step 4-5. If the memory lock switch 109 is set to therelease state of the memory lock state, the memory lock flag MLF isreset (step 4-6). If the switch 109 is set to the memory lock state, theflag MLF is set to “1” (step 4-5′). Then, step 4-7 follows. In step 4-7,if the flag MLF is set to “1”, i.e., in the memory lock state, steps 4-8to 4-11 are omitted and step 9 follows. If the flag MLF is set to “0”,i.e., in the release state of the memory lock state, a check is made byan the output of the level detector 8 to see if the output of theshifted head 5 is present or not (step 4-8). In the case of anunrecorded track, similar to the flowchart shown in FIG. 3, the contentof the memory is erased (step 4-10). In the case of a recorded track, afreeze operation of the reproduced output of the head 5 is executed(step 4-9). Thereafter, similar to step 3-5, the switch SW₃ is switchedto make the memory controller 23 operative and the frozen video image issupplied to the monitor 30 (step 4-11).

After completion of the track feed routine of the head, the connectingstates of the transmission mode setting switch 103 and receiving modesetting switch 104 are checked (step 9).

If the switch 103 has been turned on and the transmission mode has beenset, the transmission routine in step 10 is executed. If the switch 104has been turned on and the receiving mode has been set, the receivingroutine in step 11 is executed. If both switches 103 and 104 have beenturned off, step 3 follows.

Therefore, if both switches 103 and 104 have been turned off and eitherthe transmission mode or the receiving mode is not set, the processes inthe flow in step 3 and subsequent steps are executed. For example, ifthe track-up switch 107 and track-down switch 108 have been turned on,the track feed subroutine is executed in step 7.

In this case, the transmission routine (which is executed in the casewhere the switch 103 has been turned on and the transmission mode hasbeen set) will be explained with reference to FIG. 5.

In the transmission routine, a check is first made to see if the startswitch 105 has been turned on or not. If YES, step 5-2 follows. If NO,step 12 follows.

Therefore, if the start switch 105 is not turned on even when thetransmission mode was set, the processes in the foregoing flow arerepeated.

If the start switch 105 was turned on, the memory controller 23 is madeoperative such that the signals written in the memories 13 to 15 areread out and supplied to the D/A converter 26 at a rate corresponding tothe converting rate of the D/A converter 26, i.e., the converting ratecorresponding to the band of the telephone line (step 5-2). Next, theloop in steps 5-3 and 5-4 is repeated until the turn-on of the stopswitch 106 is detected in step 5-3 or until it is detected in step 5-4that the transmitting operation has been completed, namely, that all ofthe signals stored in the memories 13 to 15 have been read out.

When the turn-on of the stop switch 106 is detected, the transmittingoperation is stopped, namely, the operations to read out the signalsfrom the memories 13 to 15 and to supply them to the D/A converter 26are stopped (step 5-5). After completion of the transmitting operation,a transmission end signal is transmitted (step 5-6). Then, theprocessing routine advances to step 12.

While the above-mentioned routine is being executed, even if thetrack-up switch 107, track-down switch 108, and the like are turned on,they are not accepted. The recording routine which is executed when therecording mode setting switch 102 has been turned on step 3 will beexplained with reference to FIG. 6. FIG. 6 shows a flowchart for such arecording routine.

In the recording routine, the recording mode is first set. Namely, theswitch SW₁ is switched to connect the head 5 with the recordingprocessor 33. The switch SW₂ is switched to connect the decoder 22 withthe switch SW₃. The switch SW₃ is switched to output the signal which isinput through the switch SW₂ to the encoder 20.

The switch SW₄ is also switched to connect the decoder 22 with therecording processor 33 (step 7-0).

When the recording mode is set, the driver 6 is driven in step 7-1 toallow the head 5 to access the outermost track among the unrecordedtracks on the basis of the recording state of the tracks stored in step2. In this case, the head 5 may also access the outermost track amongthe continuous unrecorded tracks. After completion of the access in step7-1, a check is made to see if the recording execution switch 110 hasbeen turned on or not (step 7-2). If NO, step 3 follows. If YES, thevideo signal of one field or one frame is recorded (step 7-3). The headis fed by one track (step 7-4). In this manner, the recording routine isfinished.

After the recording routine shown in step 13 in FIG. 2 is executed asdescribed above, the processing routine is returned to step 3.

The receiving routine shown in step 11 in FIG. 2 will now be explainedwith reference to FIG. 7.

When it is detected in step 9 that the receiving mode setting switch 104has been turned on as described above, the receiving routine isexecuted.

A check is made in step 8-1 to see if the automatic receiving mode hasbeen set or not. If the automatic receiving mode setting switch 111 isnot turned on and the operating mode has been set in the standard mode,the processes in step 8-2 and subsequent steps are executed. If theswitch 111 has been set and the automatic receiving mode has been set,the processes in step 8-8 and subsequent steps are executed.

In the standard mode, a check is made to see if the start switch 105 (tostart reception) has been turned on or not (step 8-2). If not, thisroutine is finished and the processing routine is returned to step 12.If YES, the receiving operation is started. Namely, the memorycontroller 23 is made operative such that the signals which aretransmitted through the telephone line are written into the memories 13to 15 (step 8-3). This operation is continued until the turn-on of thestop switch 106 is detected in step 8-4 or the completion of thereception is detected in step 8-5, namely, until it is detected that thetransmission end signal which is output when the transmission side hadcompleted the transmission was received.

When the completion of the reception was detected in step 8-5, thememory lock flag MLF is set (step 8-6) and the subsequent freezeoperation is stopped. When the turn-on of the stop switch 106 isdetected in step 8-4, the processing routine is returned to step 12shown in FIG. 2 and the connecting states of the reproduction modesetting switch 101 and recording mode setting switch 102 are detected.In the reproduction mode, step 5 follows. In the recording mode, step 13follows.

The operation when the automatic receiving mode setting switch 111 hasbeen turned on and the automatic receiving mode has been set will now beexplained.

In the automatic receiving mode, as described above, the processingroutine advances from step 8-1 to step 8-8 and the presence or absenceof the magnetic sheet is detected by checking the output of the magneticsheet detection circuit 32. If no magnetic sheet is set, an IRQ flag,which will be explained hereinafter, is set (step 8-13). The displaydevice 35 displays an indication representing that the automaticreception cannot be performed (step 8-14). The processing routineadvances to step 12. The foregoing processes are repeated from step 12.

A warning indication by the display device 35 may be performed by audioor light. When the presence of the magnetic sheet 1 is detected in step8-8, a check is made to see if the IRQ flag has been reset or not (step8-9).

When the magnetic sheet 1 was taken out in the automatic receiving mode,the processing routine advances from step 8-8 to step 8-13 and the IRQflag has been set. Therefore, after the magnetic sheet was once takenout in the automatic receiving mode, if another magnetic sheet is set,this means that the IRQ flag has been set. Therefore, the processingroutine advances from step 8-9 to step 8-10. The operation to detect therecording state of the tracks shown in step 2 in FIG. 2 is executed(step 8-10). After completion of the detecting operation, the IRQ flagis reset (step 8-11).

When the magnetic sheet 1 is not taken out in the automatic receivingmode and the track recording state detecting operation is performed andthe IRQ flag has already been reset, the processing routine advancesfrom step 8-9 to step 8-12.

In step 8-12, a check is made to see if a blank track exists or not bydetecting the recording state of the tracks detected in the foregoingdetecting operation. If no blank track exists, step 8-14 follows. Awarning indicating that the automatic reception cannot be performed isindicated. If a blank track exists, step 8-15 follows. When a blanktrack is detected, a check is made to see if the track which is beingaccessed at present by the head is the outermost unrecorded track ornot. If not, the head is accessed up to the outermost unrecorded track(step 8-16). After completion of the access operation, step 8-17follows. In this case, the head 5 does not need to always access theoutermost unrecorded track but it is sufficient for the head 5 to accessany unrecorded track.

In step 8-17, to reduce the electric power consumption and to preventthe track on the magnetic sheet from being damaged by the sliding motionof the magnetic head for a long time, the driving of the motor 2 istemporarily stopped and the number of remaining recordable tracks isobtained on the basis of the recording states of the tracks which werestored due to the track recording state detecting operation, then thisnumber is displayed on the display device 35 (step 8-17). For example,the display device 35 has two digits of LEDs each consisting of sevensegments. The number of remaining unrecorded tracks is displayed by theLEDs. For example, when 40 tracks among the 50 tracks on the magneticsheet 1 are recorded tracks and 10 tracks are unrecorded tracks, “10” isdisplayed.

In the next step 8-18, the output of the receiving detection circuit ischecked. If the reception command signal is detected, step-8-19 follows.If it is not detected, the processing routine is returned to step 12 (instep 8-18). In step 8-19, the receiving operation is started similar tostep 8-3. The processes in steps 8-20 and 8-21 are repeated until thestop switch 106 is turned on and the receiving operation is stopped, oruntil it is detected that, for example, 90% of the signal of one pictureplane has been written into the memories 13 to 15, namely, until it isdetected that a predetermined time before the reception end state hascome.

When the turn-on of the stop switch 106 is detected, the processingroutine advances from step 8-20 to step 8-21 and the receiving operationis stopped (step 8-22). The receiving routine is finished and theprocessing routine is returned to step 12. On the other hand, if it isdetected that the predetermined time before the reception end state hascome, the processing routine advances from step 8-21 to step 8-23. Themotor 2 is driven to rotate the magnetic sheet 1, thereby preparing forthe recording operation (step 8-23). The receiving operation isobviously also continued during this interval. It is sufficient to setthe foregoing predetermined time to be slightly longer than the timenecessary for the completion of the rotation servo after the motor 2started rotating. In this state, the apparatus waits for the receptionend signal, i.e., the transmission end signal (step 8-24). Aftercompletion of the reception or transmission, the video signals of onepicture plane stored by the receiving operation are read out of thememories 13 to 15 and recorded on the magnetic sheet (step 8-25).

Namely, the memory controller 23 is operated in a manner such that theswitch SW₄ is switched to connect the color difference matrix circuit 19with the recording processor, and the video signals of one picture planestored in the memories 13 to 15 are output to the D/A converters 16 to18 by the receiving operation. Thus, the received video image can beconfirmed. This embodiment is also characterized by this point.

After completion of the recording, the motor 2 is stopped to immediatelystop the rotation of the magnetic sheet 1 (step 8-26). The number ofrecordable tracks stored in the control circuit 100 is decreased anddisplayed on the display device 35 (step 8-27). If the number ofrecordable tracks is 0, step 12 follows and if it is not 0, step 8-15follows (step 8-28). Therefore, if the recordable track does not exist,the processing routine advances to step 12. When the automatic receivingmode has been set, the processing routine advances from step 9 to step11 shown in FIG. 2. Practically speaking, after step 8-1 shown in FIG.7, the processes in steps 8-8 to 8-12 are executed. However, in thisstate, since no recordable track exists, the processing routinepropresses from step 8-12 to step 8-14. A warning representing that theautomatic reception cannot be performed is indicated by the displaydevice 35. The execution of the new receiving operation is inhibited (inthis case, step 8-19 to start the receiving operation is not executed).

If the recordable track exists, step 8-15 follows and the foregoingoperations are repeated.

In the flowchart shown in FIG. 7, after the automatic receiving mode hasonce been set, even if the reception command is not obtained, it issubstantially impossible to change the track to be accessed by the head5 by operating the track-up switch 107 and track-down switch 108.Namely, if the reception command is not obtained after the receivingmode was set, the processes which have previously been described in FIG.2 are executed from step 12. In steps 5 to 7, the track-up switch 107and track-down switch 108 are accepted and the freeze operation isperformed. The video signals stored in the memories 13 to 15 arereproduced on the monitor. However, by executing step 11 after step 9,namely, by performing steps 8-1 to 8-17 shown in FIG. 7, the head 5automatically accesses the outermost unrecorded track again, so that theoperations of the switches 107 and 108 are remarkably restricted.

However, as shown in the flowchart of FIG. 8, by exchanging steps 8-15and 8-16 with steps 8-17 to 8-19, the operations of the switches 107 and108 can be equalized to the operations in the ordinary reproduction modeuntil the reception command is obtained.

As described in the above embodiment, since the magnetic sheet 1 is notrotated for the interval when the video data, which is transferred for along time, is stored into the memories 13 to 15, there are suchadvantages that abrasion of the sheet 1 and magnetic head 5 can beprevented an electric power consumption can be also reduced.

On the other hand, in the automatic receiving mode, since the automaticreception is performed while continuously accessing the head onto theunrecorded tracks, there is an advantage such that use efficiency isgood.

In the foregoing embodiment, the system wherein the recording states ofthe tracks on the magnetic sheet 1 are always stored has been described.The invention can be also applied to a system which does not alwaysstore the recording states of the tracks. In this case, an unrecordedtrack is sought when the automatic receiving mode is set and if anunrecorded track exists, the recording head stands by on this track. Ifan unrecorded track does not exist, a warning is given.

In the foregoing embodiment, even if the memory lock state is set by thememory lock switch 109, the contents of the memories 13 to 15 arerewritten for reception in the receiving mode irrespective of the memorylock state. Namely, by setting the receiving mode, the memory enters thesame state as that when the memory lock was released.

In the foregoing embodiment, a magnetic recording medium was used as therecording medium. However, an optical recording medium may be also used.

In the foregoing embodiment of the invention, the head 5, the positionof which changes with respect to the recording medium, was used asrecording means. A discriminating means for discriminating whether theportion accessed by the recording means upon reception is a recordedportion or an unrecorded portion, (step 8-15 in FIG. 7) is provided anduses the output of the level detector 8 (step 8-16 in FIG. 7). Controlmeans are provided for allowing the recording means to access theunrecorded portion on the basis of the result of the discrimination.

On the other hand, the memories 13 to 15 are provided as memory meansfor temporarily storing the received data before it is recorded onto therecording medium. The motor 2 and motor drive circuit 36 are provided asdriving means for driving the recording medium. The control circuit 100(to execute steps 8-21 and 8-23 in the flowchart shown in FIG. 7) isprovided as control means for making the driving means operative only apredetermined period of time before the completion of the storage ofdata into the memory means.

In the foregoing embodiment, the display device 35 is provided todisplay the number of unrecorded tracks in step 8-17 shown in FIG. 7which is executed when the receiving mode setting switch 104 and theautomatic receiving mode setting switch 111 have been turned on.

In the foregoing embodiment, the movable magnetic head 5 has been usedas reproducing means. However, another kind of head may be also used.The recording medium may be also moved without moving the head. It issufficient that the access position changes.

Although the memories 13 to 15 for storing the video signals of onepicture plane have been used as memory means for storing the datareproduced by the reproducing means, their memory capacities are not solimited.

The level detector 8 to detect the output of the reproducing means hasbeen used as discriminating means for discriminating the recording stateat the access position of the reproducing means.

The control circuit 100 (to execute steps 4-8 to 4-10 shown in FIG. 4)is provided as control means for controlling the storage state of thememory means on the basis of the result of the discrimination of thediscriminating means. When the unrecorded state is detected, thecontents of the memories 13 to 15 are erased. However, in place of theseerasing operations, for example, special patterns or special chrominancesignals may be also written into the memories 13 to 15.

As described above, according to this embodiment, for example, when theaccess position of the reproducing means is in the unrecorded state, itis prevented that the output of the reproducing means is written at theaccess position in the unrecorded state by the recording means. In thismanner, proper control can be performed.

On the other hand, according to the present embodiment, there is such anadvantage that immediately after the completion of the reception by thememory means, the data can be recorded onto the recording medium.

On the other hand, according to the embodiment, upon reception, therecordable unrecorded amount of the recording medium is displayed, sothat an amount of data which can be received can be preliminarily known.

According to the embodiment, in the reproducing apparatus in which thereproduced video signals are automatically written into the memories 13to 15 and the video data is read out and reproduced from the memories inthe ordinary operating mode, if the data was reproduced from theunrecorded track, the black signal is written into the memory in placeof the low level noise signal. Therefore, there are advantages such thatthe reproduced image can be clearly displayed and the presence orabsence of the reproduced signal can be easily discriminated.

On the other hand, there is considered a method whereby the reproductionsignal level is detected and the reproduction signal is written as it isinto the memory even if the signal level is low and the output of thememory is muted. However, since this method needs a muting circuit, theapparatus of the invention has such an effect that the hardware can bereduced as compared with the above-mentioned muting method.

What is claimed is:
 1. A receiving apparatus comprising; receiving meansfor receiving color image data from a partner apparatus; setting meansfor setting access means for a storage medium in a standby state tostore the received color image data in a predetermined area of thestorage medium; output means for reproducing, according to a manualinstruction of an operator, the color image data stored in the storagemedium by using said access means and outputting the reproduced colorimage data on a display device; and detecting means for detecting thereceiving of the color image data by said receiving means, wherein evenif the reproduced color image data is being output by said output meansaccording to the manual instruction of the operator, said setting meansautomatically sets said access means in the standby state to store thereceived color image data in response to a reception detection by saiddetecting means.
 2. A receiving apparatus according to claim 1, whereinthe predetermined area is an area set to store the color image datareceived by said receiving means.
 3. A receiving apparatus according toclaim 1, wherein the storage medium can store images for a plurality ofimage planes.
 4. A receiving apparatus according to claim 1, whereinsaid output means includes conversion means for converting the colorimage data to a signal format for displaying to the display device.
 5. Areceiving apparatus according to claim 4, further comprising dataconversion means for converting the color image data received by saidreceiving means to a signal format for storing in the storage medium. 6.A method operative on a receiving apparatus, said method comprising: areceiving step of receiving color image data; a setting step of settingaccess means for a storage medium in a standby state to store thereceived color image data in a predetermined area of the storage medium;an output step of reproducing, according to a manual instruction of anoperator, the color image data stored in the storage medium by using theaccess means and outputting the reproduced color image data on a displaydevice; and a detecting step of detecting the receiving of the colorimage data by said receiving step, wherein even if the reproduced imagedata is being output at said output step according to the manualinstruction of the operator, in said setting step the access means isautomatically set in the standby state to store the received color imagedata in response to a reception detection by said detecting step.
 7. Amethod according to claim 6, wherein the predetermined area is an areaset to store the color image data received by said receiving step.
 8. Amethod according to claim 6, wherein the storage medium can store imagesfor a plurality of image planes.
 9. A method according to claim 6,wherein said output step includes a conversion step of converting thecolor image data to a signal format for displaying to the displaydevice.
 10. A method according to claim 9, further comprising a dataconversion step for converting the color image data received by saidreceiving step to a signal format for storing in the storage medium.